When Katherine of Aragon is brought to the Tudor court as a young bride, the oldest princess, Margaret, takes her measure. With one look, each knows the other for a rival, an ally, a pawn, destined - with Margaret's younger sister Mary - to a sisterhood unique in all the world. The three sisters will become the queens of England, Scotland and France. United by family loyalties and affections, the three queens find themselves set against each other. Historical fiction at its best.